When choosing a painter and decorator or an interior designer you should be sure that they are capable of completing the work to the standard you expect before they start. If you choose someone that can't complete the work to the finish you expect you can end up being both disappointed and spending more money to get the work done properly, most decorating services will be able to show you examples of work they have carried out previously.
There are decorating exams decorators can take to show they have tested decorating skills. When a decorator applies for entry into a professional decorating organisation, part of the requirements he will have to meet will often be passing exams, or passing independent inspections of their work. It is wise to employ a decorator who is part of a professional decorating organisation, as these organisations often have benefits for both the contractor and the customer, such as an arbitration service if there is a dispute. Decorators as part of an organisation will commonly be aware of the latest regulations and rules regarding their job, so you can rest assured that your newly decorated home complies with building regulations.
It is wise to meet your designer face to face, in order to acquaint yourself with your decorator, and so you can be sure he will stick to your design ideas. A face to face meeting allows you to fully explain your ideas to the designer, and perhaps accept advice from the designer on ideas or compromises to save money. When meeting the designer, you should also get a written quotation, as this can give you some backup if you think you have been overcharged.
If you do get a quotation make sure its a written quotation as verbal quotes can easily be forgotton, also make sure you know exactly whats included with that quote. Discuss with the decorator the possibility of a fixed labour cost for the job as contractors that charge by the hour can work out very expensive, especially if unforeseen delays come up.
Redecorating your home should be a pleasurable experience, and the contractor you hire should make the whole task as simple and stress-free as possible. You should research your contractor before hiring them ask for references, and if possible, interview the contractor to reassure yourself that they will follow your plans, and that you feel as though you can trust them.